First of all, CONGRATS!! Secondly, no, he is NOT too heavy. I was lifting my 35 lb. 3 year old while pregnant with my, now, 8 week old baby boy. So, you should be just fine! Ask your doc to make sure, and when you are 7-9 months along it may not be comfy for your back to do that, but until then, you are fine. Good luck!